/*********************************************************************
 *                     openNetVM
 *              https://sdnfv.github.io
 *
 *   BSD LICENSE
 *
 *   Copyright(c)
 *            2015-2019 George Washington University
 *            2015-2019 University of California Riverside
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in
 *       the documentation and/or other materials provided with the
 *       distribution.
 *     * The name of the author may not be used to endorse or promote
 *       products derived from this software without specific prior
 *       written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * msgbuf.h - buffer, send and receive the packets to/from controller
 ********************************************************************/

#ifndef _MSGBUF_H_
#define _MSGBUF_H_

struct msgbuf {
        char *buf;
        int len, start, end;
};

struct msgbuf *
msgbuf_new(int bufsize);
int
msgbuf_read(struct msgbuf *mbuf, int sock);
int
msgbuf_read_all(struct msgbuf *mbuf, int sock, int len);
int
msgbuf_write(struct msgbuf *mbuf, int sock, int len);
int
msgbuf_write_all(struct msgbuf *mbuf, int sock, int len);
void
msgbuf_grow(struct msgbuf *mbuf);
void
msgbuf_clear(struct msgbuf *mbuf);
void *
msgbuf_peek(struct msgbuf *mbuf);
int
msgbuf_pull(struct msgbuf *mbuf, char *buf, int count);
void
msgbuf_push(struct msgbuf *mbuf, char *buf, int count);
#define msgbuf_count_buffered(mbuf) ((mbuf->end - mbuf->start))

#endif // _MSGBUF_H_
